由三氟甲基取代的3-氮杂-1,5-烯炔经AgOOCCF催化的环化/磺酰基迁移级联反应选择性地合成了2-三氟甲基-5-(芳基磺酰基)甲基吡咯和2-三氟甲基-4-(芳基磺酰基)甲基吡咯3和CsOPiv。在Cs 2 CO 3存在下,通过芳基亚磺酸的消除,由七个原子的3-氮杂-1,5-烯炔骨架生成烷基乙烯基取代的吡咯。提出了两种离子对中间体,并在机理研究中成功分离出关键中间体氮杂-二烯-炔。
A gold-catalyzed regiospecific hydration of N-tosyl propargylic amines has been developed. In the presence of a catalytic amount of the gold catalyst NaAuCl4·2H2O, both alkyl and aryl-substituted N-tosyl propargylic amines were smoothly converted into the corresponding β-amino ketones with excellent regioselectivities and high yields (up to 85%). Further transformations of the obtained β-amino ketones
Synthesis of Polyfluoroalkyl Cyclobutenes from 3-Aza-1,5-enynes via an Aza-Claisen Rearrangement/Cyclization Cascade
作者:Xiaoyi Xin、Dongping Wang、Fan Wu、Chunxiang Wang、Haolong Wang、Xincheng Li、Boshun Wan
DOI:10.1021/ol4020738
日期:2013.9.6
A facile synthetic route to access polyfluoroalkyl functionalized cyclobutenes bearing an exo cyclic double bond from 3-aza-1,5-enynes is reported. The reaction proceeds via a thermal aza-Claisen rearrangement to give an allene-imine intermediate; subsequent cyclization affords the cyclobutene core. The kinetics of the transformation of starting material and the intermediate was studied by 1H NMR spectroscopy
报道了一种容易的合成路线,该路线可从3-氮杂-1,5-烯炔中获得带有外环双键的多氟烷基官能化的环丁烯。反应通过热氮杂-克莱森重排进行,得到烯丙基-亚胺中间体;随后环化得到环丁烯核。通过1 H NMR光谱研究了起始原料和中间体的转化动力学,其中揭示了连续的反应。
One-pot synthesis of pyridines from 3-aza-1,5-enynes
作者:Xiaoyi Xin、Dongping Wang、Xincheng Li、Boshun Wan
DOI:10.1016/j.tet.2013.10.038
日期:2013.12
Efficient one-pot transformation of 3-aza-1,5-enynes to poly-substituted pyridines in good to excellent yields has been developed. This reaction involved cyclization of 3-aza-enynes and elimination of sulfinyl acids steps. (C) 2013 Elsevier Ltd. All rights reserved.